ERROR_DEVICE_NOT_FOUND is -3 not 3
Testing getDevices
Required a change to the callbackwrapper to support objects being returned.
Closes #43
More proper testing.
Related to issue #2
test getDeviceParameter and getDeviceParameterSync
Closes #40
Test setDeviceParameter and setDeviceParameterSync
Closes #41
Test learn and dim
In relation to #2
Merge pull request #48 from kmpm/testing

Testing